The Kingdom of Middle England was a powerful Anglo-Saxon kingdom that existed from the late 6th century to the early 9th century. It was located in what is now the English Midlands and was ruled by the powerful Mercian dynasty. The name Mercia comes from the Old English word for 'border people' and was used to refer to the people who lived in the area. The kingdom was known for its strong military and its cultural and religious influence on the surrounding areas.